// this program copies a file from args[0] to args[1]
// it illustrates both binary and text io in java.

import java.io.*;

public class filecopy
{
    public static final int BUFSIZE = 1024;

    public static void main(String[] args)  // args contain src, dest
    { int n; // number of bytes succesfully read
      try
      {
	// file channels
	FileInputStream fin = new FileInputStream(args[0]);
	FileOutputStream fout = new FileOutputStream(args[1]);

	// binary io through channel:
	DataInputStream din = new DataInputStream(fin);
	DataOutputStream dout = new DataOutputStream(fout);

        // copy buffer
	byte[] buffer = new byte[BUFSIZE];
	
	// copy loop
	n = buffer.length;
	while (n>0)
	    {
		n = din.read(buffer,0,buffer.length);
		if (n>0) dout.write(buffer,0,n);
		// technically, write also writes UP TO n bytes, but
		// it's unlikely to be less than n for local files.
	    } 
	din.close();
	dout.close();

      } catch (IOException e) {e.printStackTrace();}
    } // main


    // the following version uses buffered streams, but can only
    // copy ascii files.
    public static void main2(String[] args)
    {
      try
      {	
	FileInputStream fin = new FileInputStream(args[0]);
	FileOutputStream fout = new FileOutputStream(args[1]);
	BufferedReader br = new BufferedReader(new InputStreamReader(fin));
	PrintWriter pw = new PrintWriter(new OutputStreamWriter(fout));

	String sin = "blah";  // input string;
	while (sin != null)
	    {
		sin = br.readLine(); // sin doesn't include the \n
		if (sin!=null) pw.println(sin); // sin==null at eof
	    }
	br.close();
	pw.close();
      } catch (IOException e) {e.printStackTrace();}
    } // main2

} // filecopy